Malicious PDF — malware analysis report

Static analysis result for SHA-256 500657d335022dcc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 16:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf6fa0ae98181fe0af7429fc3e7b1af5 SHA-1: 791a8019856b2b5395a70400da0b11972da33b6b SHA-256: 500657d335022dcc1ff750b02832e0250c3f3682b05060461751baf31fc2eb8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded links suggest an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://noithatmyhome.com/img/files/jukoluzifis.pdf In PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/jovibi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kegte49oelhalke3iektttp36i/sawiteweredefujarexude.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/16425402749.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/2060936565.pdfIn PDF document text
    • https://nistd.in/userfiles/file/5722597958.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/togajemasasaxomowidasiki.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/45553802088.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210919_96C27E0B574E65B9.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/83520134305.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109181805499171.pdfIn PDF document text
    • https://trieurodata.ro/images/file/4648381777.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/rotosuxuxonamidewitejom.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3bab112887c248e8533e66699864e9c6/futivawapujumuwoxof.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ced10b0e3---javolewo.pdfIn PDF document text
    • https://primer-spb.ru/files/files/89743280698.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/bowetonotesexopaj.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/vawajogiresawigolop.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/49494047043.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kukor.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131158b858fa---43060448952.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/48956657657.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/88319710011.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d5279f7cd8799ea5091cabb49a191475/lubevisedopetapaguril.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e628fd22919a897720ea4adb2ead5e96/sifido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=paranormal+activity+the+marked+ones+123moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 18704 bytes
SHA-256: adb433000ef4e684762a774a3b091498fb9781612ba5418b7c5d88fcc28bc896
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 11252 bytes
SHA-256: 5b24e7eefa48f0b1fb34a27692f90d06ce4c398f9189d5f96e02ce057e54e3dd
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1